Is there a need for a main gridle for 1000hp? I would say NO if the main caps are doweled. But whoo knows ho much power one of these blocks can handle. I'm sure if we decide to step up ( 1300hp )we will do something to the bottom end. We have a few things in mind but were not sure which way to go yet.

Yes, the main caps are doweled. We think this really helps out.

No the main caps are not straped.

1.5 and 2" sch 10 316ss el's from McMaster Carr. The 1.5 actully measure 1.625 on the i.d.